drive toward coed y brenin, just after the last village(with public toilets) before you get to coed y brenin (coming from doll) turn right, follow the road, eventually you get to a small carpark thats on the coed y brenin trails(directions sound vague but makes sense when you drive it). ive slept there lots of times. also stayed in main coed y brenin carpark lots of times.